Missing include bits c config h when cross compiling 64 bit program on 32 bit in Ubuntu

Question

I am running the 32bit version of Ubuntu 10 10 and trying to cross compile to a 64 bit target  Based on my research  I have installed the g  -multilib package   The program is a very simple hello world    include  lt iostream gt   int main  int argc  char   argv       std  cout  lt  lt   hello world   lt  lt  std  endl    return 0      Compile   g   -m64 main cpp   Error   In file included from main cpp 1   usr include c   4 4 iostream 39  fatal error  bits c  config h  No such file or directory compilation terminated    I have found a c  config h file but they reside under the i486-linux-gnu and i686-linux-gnu directories in  usr include c   4 4  There is not c  config h in  usr include c   bits   Any ideas on what I am missing  Compiling without the -m64 flag works fine  a out is created and runs correctly    Edit Thanks to the hint from  nightcracker  I did a little more investigation into the include structure on the 32 and 64 bit systems  I have added an answer below that  fixes  the problem temporarily but I think it will break on the next update  Basically  I am missing a directory called  usr include c   4 4 i686-linux-gnu 64 that should contain a subdirectory called bits that has the missing include file  Any idea what package should be taking care of this

User · Answer

On my 64 bit system I noticed that the following directory existed:

/usr/include/c++/4.4/x86_64-linux-gnu/32/bits

It would then make sense that on my 32 bit system that had been setup for 64bit cross compiling there should be a corresponding directory like:

/usr/include/c++/4.4/i686-linux-gnu/64/bits

I double checked and this directory did not exist. Running g++ with the verbose parameter showed that the compiler was actually looking for something in this location:

jesse@shalored:~/projects/test$ g++ -v -m64 main.cpp 
Using built-in specs.
Target: i686-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.4.4-14ubuntu5' --with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.4 --enable-shared --enable-multiarch --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.4 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --enable-targets=all --disable-werror --with-arch-32=i686 --with-tune=generic --enable-checking=release --build=i686-linux-gnu --host=i686-linux-gnu --target=i686-linux-gnu
Thread model: posix
gcc version 4.4.5 (Ubuntu/Linaro 4.4.4-14ubuntu5) 
COLLECT_GCC_OPTIONS='-v' '-m64' '-shared-libgcc' '-mtune=generic'
 /usr/lib/gcc/i686-linux-gnu/4.4.5/cc1plus -quiet -v -imultilib 64 -D_GNU_SOURCE main.cpp -D_FORTIFY_SOURCE=2 -quiet -dumpbase main.cpp -m64 -mtune=generic -auxbase main -version -fstack-protector -o /tmp/ccMvIfFH.s
ignoring nonexistent directory "/usr/include/c++/4.4/i686-linux-gnu/64"
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory "/usr/lib/gcc/i686-linux-gnu/4.4.5/../../../../i686-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/c++/4.4
 /usr/include/c++/4.4/backward
 /usr/local/include
 /usr/lib/gcc/i686-linux-gnu/4.4.5/include
 /usr/lib/gcc/i686-linux-gnu/4.4.5/include-fixed
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
GNU C++ (Ubuntu/Linaro 4.4.4-14ubuntu5) version 4.4.5 (i686-linux-gnu)
    compiled by GNU C version 4.4.5, GMP version 4.3.2, MPFR version 3.0.0-p3.
GGC heuristics: --param ggc-min-expand=98 --param ggc-min-heapsize=128197
Compiler executable checksum: 1fe36891f4a5f71e4a498e712867261c
In file included from main.cpp:1:
/usr/include/c++/4.4/iostream:39: fatal error: bits/c++config.h: No such file or directory
compilation terminated.

The error regarding the ignoring nonexistent directory was the clue. Unfortunately, I still don't know what package I need to install to have this directory show up so I just copied the /usr/include/c++/4.4/x86_64-linux-gnu/bits directory from my 64 bit machine to /usr/include/c++/4.4/i686-linux-gnu/64/bits on my 32 machine.

Now compiling with just the -m64 works correctly. The major drawback is that this is still not the correct way to do things and I am guessing the next time Update Manager installs and update to g++ things may break.

User · Answer

Did you try adding -I usr include c   4 4 i486-linux-gnu or -I usr include c   4 4 i686-linux-gnu

User · Answer

Adding this answer partially because it fixed my problem of the same issue and so I can bookmark this question myself   I was able to fix it by doing the following   sudo apt-get install gcc-multilib g  -multilib   If you ve installed a version of gcc   g   that doesn t ship by default  such as g  -4 8 on lucid  you ll want to match the version as well   sudo apt-get install gcc-4 8-multilib g  -4 8-multilib

User · Answer

Seems to be a typo error in that package of gcc  The solution   mv  usr include c   4 x i486-linux-gnu  usr include c   4 x i686-linux-gnu 64

User · Answer

This bug is fixed in  gcc-4 6    https   bugs launchpad net ubuntu  source gcc-4 5  bug 793411

User · Answer

Basically It is used in HeapOverflows or other reversing type Problems i e  If you want to change a 64 bit ELF to 32 bit ELF and it is showing error while converting   You can simply run the commands  apt-get install gcc-multilib g  -multilib   which will update your libraries Packages upgraded      The following additional packages will be installed      g  -8-multilib gcc-8-multilib lib32asan5 lib32atomic1 lib32gcc-8-dev     lib32gomp1 lib32itm1 lib32mpx2 lib32quadmath0 lib32stdc  -8-dev     lib32ubsan1 libc-dev-bin libc6 libc6-dbg libc6-dev libc6-dev-i386     libc6-dev-x32 libc6-i386 libc6-x32 libx32asan5 libx32atomic1     libx32gcc-8-dev libx32gcc1 libx32gomp1 libx32itm1 libx32quadmath0     libx32stdc  -8-dev libx32stdc  6 libx32ubsan1   Suggested packages      lib32stdc  6-8-dbg libx32stdc  6-8-dbg glibc-doc   The following NEW packages will be installed      g  -8-multilib g  -multilib gcc-8-multilib gcc-multilib lib32asan5     lib32atomic1 lib32gcc-8-dev lib32gomp1 lib32itm1 lib32mpx2     lib32quadmath0 lib32stdc  -8-dev lib32ubsan1 libc6-dev-i386     libc6-dev-x32 libc6-x32 libx32asan5 libx32atomic1 libx32gcc-8-dev     libx32gcc1 libx32gomp1 libx32itm1 libx32quadmath0 libx32stdc  -8-dev     libx32stdc  6 libx32ubsan1   similar to this will be shown to your terminal

User · Answer

From my experience  sudo apt-get install gcc-multilib g  -multilib helps  But my another issue is that I FORGET to clean the directory so I still get the same error  It is the first time to use clang or cmake  So I just delete my original directory and re-compile and it works  Hope it helps someone like me

User · Answer

While compiling in RHEL 6 2  x86 64   I installed both 32bit and 64bit libstdc  -dev packages  but I had the  c  config h no such file or directory  problem   Resolution   The directory  usr include c   4 4 6 x86 64-redhat-linux was missing   I did the following   cd  usr include c   4 4 6  mkdir x86 64-redhat-linux cd x86 64-redhat-linux ln -s    i686-redhat-linux 32   I m now able to compile 32bit binaries on a 64bit OS

[ubuntu] Missing include "bits/c++config.h" when cross compiling 64 bit program on 32 bit in Ubuntu

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